@Kurt ************
I don't understand why people want to see written you need it for 5 years.
It is mentioned as visa requirement and the visa is valid for 5 years, immigration checks it also as visa requirement when you do in country extension, so I do not see why it should not be kept for 5 years or as log as you use the visa.
Immigration is not responsible for issuing the visa, but is responsible for checking aliens as it is called in Thai law to comply with requirements to enter the country, and also they are responsible for extensions.
Some people want to have written out everything, some said TM47 was not for DTV because it is not mentioned on the visa.
Only needing to have 500K BEFORE you got to Thailand and no need to have it while you are in Thailand just does not make any sense.
So I just believe what they tell me at the Immigration office, and not what some people here want me to believe.